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The DSI Smoke and Fire Curtain using the DSI-1HR Rated fabric is approved for a CE D120 label. When tested to EN 12101-1 as part of the DSI Smoke and Fire Curtain, DSI-1HR Rated has successfully passed Annex B (material durability cycle test), Annex C (air leakage test) and Annex D (120 minutes fire resistance). It is tested to BS 476 Pt 6 (fire propagation) and Pt 7 (surface spread of flame), ASTM E84 & UL 723. The curtain fabric DSI-1HR Rated is a specially formulated medium weight fiberglass fabric, coated with aluminum pigmented polyurethane on both sides of the fabric which creates a reflective heat shield and enhances durability and flexibility of the fabric. This does not confirm the ability to fail safe. A curtain that is powered down under normal test conditions from either mains power or the battery supply is only proving that it can deploy when powered. This method of operation should be used to deploy the system at all times. This facility ensures a controlled descent of the curtain even in the event of total power failure. The weight of the bottom bar will force the motor windings to return generating a back EMF. Upon receipt of a fire or test signal the holding voltage will be removed to the motor. The current drawn by the motor will begin to rise, this will be detected by the motor control circuit and the supply will be stepped back to a holding voltage of approximately 4 volts. The 24v motor will retract the curtain until the bottom bar pulls against the underside of the head box. Limit switch control has been replaced with current-limiting systems to determine the upper position of the curtain. This makes the system virtually invisible until activated. The assembly comprises a fire rated fiberglass fabric wound around a roller which encases a compact head box that is typically installed above the ceiling with side guides that are buried in the wall. As a result DSI-C1HR Curtain is one of the most advanced, yet cost effective systems on the market. DSI-C1HR Automatic Fire protective Smoke Curtains are totally gravity fail safe and incorporate the latest in electronic technology. |
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